3 activies from curriculum (#194)

* 3 activies from curriculum

* fixing style

docs/coding.md

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+# Coding Activites
+
+12 computer science activities, with cross-curricular opportunities in design and technology, science, and math.
+
+* [Download Curriculum Materials](https://education.lego.com/en-us/downloads/mindstorms-ev3)
+
+## Activites
+
+```codecard
+[
+{
+  "name": "Three Point Turn",
+  "description": "Activity 1",
+  "url":"/coding/three-point-turn-1",
+  "cardType": "example"
+}, {
+  "name": "Three Point Turn",
+  "description": "Activity 1",
+  "url":"/coding/three-point-turn-2",
+  "cardType": "example"
+}, {
+  "name": "Three Point Turn",
+  "description": "Activity 1",
+  "url":"/coding/three-point-turn-3",
+  "cardType": "example"
+}    
+]
+```

docs/coding/three-point-turn-1.md

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+# Three Point Turn Activity 1
+
+```blocks
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+    motors.largeBC.tank(75, 30)
+    loops.pause(1500)
+    motors.largeBC.tank(-30, -75)
+    loops.pause(1000)
+    motors.largeBC.tank(50, 50)
+    loops.pause(3000)
+})
+```

docs/coding/three-point-turn-2.md

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+# Three Point Turn Activity 2
+
+```blocks
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+    motors.largeBC.tank(75, 30)
+    loops.pause(1500)
+    motors.largeBC.tank(-30, -75)
+    sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectNear);
+    motors.largeBC.tank(0, 0)
+    loops.pause(1000)
+    motors.largeBC.tank(50, 50)
+    loops.pause(3000)
+})
+```

docs/coding/three-point-turn-3.md

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+# Three Point Turn Activity 3
+
+```blocks
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+    motors.largeBC.tank(75, 30)
+    loops.pause(1500)
+    motors.largeBC.tank(-30, -75)
+    sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectNear);
+    motors.largeBC.tank(0, 0)
+    music.playSoundEffect(sounds.animalsDogBark1)
+    loops.pause(1000)
+    motors.largeBC.tank(50, 50)
+    loops.pause(3000)
+})
+```